:root {
    --device-width: 770px;
    --device-height: 1336px;
    --ui-width: 640px;
    font-size: 15px;
}

body {
    background-color: #000;
    margin: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: Helvetica;
    padding: 4rem 0;
}

h2 {
    color: #6e6e73;
    text-align: center;
    font-size: 4.5rem;
    font-weight: 600;
    margin: 6rem 0;
}

h2 p {
    margin: 0;
    color: #fff;
}

#iphone {
    position: relative;
    width: var(--device-width);
    height: var(--device-height);
}

#hardware {
    width: 100%;
    height: 100%;
    background-image: url(./images/phone.jpg);
    background-size: var(--device-width) var(--device-height);

}

#ui {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}

#ui .top-ui {
    display: block;
    width: var(--ui-width);
    height: auto;
    margin: 70px auto 0;
    padding-bottom: 30px;
    border-bottom: 1px solid #222;
}

#ui ul {
    list-style: none;
    margin: 0;
    padding: 0;

    --progress: 0;
}

#ui ul li img {
    display: block;
    width: var(--ui-width);
    height: auto;
    margin: 10px auto;
    padding-bottom: 10px;
    border-bottom: 1px solid #222;
    transform: scale(calc(1.8 - (0.8 * var(--progress))))
        translateY(calc(-60px * (1 - var(--progress))));
    opacity: var(--progress);
}
